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Metals 2018, 8(4), 276; https://doi.org/10.3390/met8040276

Enhancing the Hardness and Compressive Response of Magnesium Using Complex Composition Alloy Reinforcement

1
Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore
2
Department of Mechanical & Industrial Engineering, University of Toronto St. George Campus, Toronto, ON M5S 1A1, Canada
*
Author to whom correspondence should be addressed.
Received: 22 March 2018 / Revised: 10 April 2018 / Accepted: 14 April 2018 / Published: 17 April 2018
(This article belongs to the Special Issue Metal Matrix Composites)
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Abstract

The present study reports the development of new magnesium composites containing complex composition alloy (CCA) particles. Materials were synthesized using a powder metallurgy route incorporating hybrid microwave sintering and hot extrusion. The presence and variation in the amount of ball-milled CCA particles (2.5 wt %, 5 wt %, and 7.5 wt %) in a magnesium matrix and their effect on the microstructure and mechanical properties of Mg-CCA composites were investigated. The use of CCA particle reinforcement effectively led to a significant matrix grain refinement. Uniformly distributed CCA particles were observed in the microstructure of the composites. The refined microstructure coupled with the intrinsically high hardness of CCA particles (406 HV) contributed to the superior mechanical properties of the Mg-CCA composites. A microhardness of 80 HV was achieved in a Mg-7.5HEA (high entropy alloy) composite, which is 1.7 times higher than that of pure Mg. A significant improvement in compressive yield strength (63%) and ultimate compressive strength (79%) in the Mg-7.5CCA composite was achieved when compared to that of pure Mg while maintaining the same ductility level. When compared to ball-milled amorphous particle-reinforced and ceramic-particle-reinforced Mg composites, higher yield and compressive strengths in Mg-CCA composites were achieved at a similar ductility level. View Full-Text
Keywords: magnesium; high entropy alloy; composite; hardness; compressive properties magnesium; high entropy alloy; composite; hardness; compressive properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tun, K.S.; Zhang, Y.; Parande, G.; Manakari, V.; Gupta, M. Enhancing the Hardness and Compressive Response of Magnesium Using Complex Composition Alloy Reinforcement. Metals 2018, 8, 276.

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